boneseed (Chrysanthemoides monilifera subsp. monilifera)
Less than a decade ago, this South African plant was prevalent along Taroona's foreshore. In some places it formed a dense thicket, excluding all other plant species. TEN have successfully cleared all major infestations between the High School and Hinsby Beach. However, control is ongoing as the seed in the soil remains viable for up to 15 years. Other boneseed plants still occur in more difficult to reach locations, such as on the Alum Cliffs and the foreshore cliffs north of the High School.
Boneseed is identified as a high priority weed in Tasmania's southern region. At the state level, Boneseed is a declared weed, which means that in Tasmania, land managers have a legal responsibility to control it. Australia-wide it is listed as a Weed of National Significance (WONS).
Boneseed does have habitat value. Dense stands of boneseed sometimes provide habitat for little penguins. If this is the case, staged removal of the weed is necessary and its replacement with an appropriate native alternative, such as coast wattle (Acacia longifolia subsp. sophorae)
Dispersal: Seeds are spread by birds, animals and ants. Dumping of plants carrying seeds also spreads the weed, as does infected gravel or topsoil.
Control: Seedlings can be easily hand-pulled. They are easily distinguished from other plants by their downy-white juvenile leaves (see top photo). Larger shrubs need to be cut and pasted with herbicide immediately after cutting. After treatment, plant material can be left on-site to rot - unless it carries berries, in which case it must be bagged and removed.
Safe alternative: Coast wattle (Acacia longifolia subsp. sophorae)